1960s, the city of Clerville. The forthcoming visit of heiress Eva Kant, who'll be bringing a famous pink diamond with her, catches the attention of Diabolik, the infallible and elusive thief whose real identity is unknown: while trying to steal the jewel, he finds himself bewitched by Eva's charm, a feeling she may be reciprocating. But the police, led by relentless Inspector Ginko, is rapidly closing in on him...
Paolo needs to reach the castle of Alberto Caccia, where he was invited to spend Christmas with his family and Margherita, the ninth month of pregnancy. With them there will also be blessed, daughter of Alberto and childhood friend of Margherita, who was also pregnant. Among various mishaps and blunders, Paolo will combine another of his, coming to make everyone believe, because of a misunderstanding, that Alberto's died for his fault.
Diabolik narrowly escapes Inspector Ginko's latest trap, leaving his partner in crime Eva Kant behind. Furious, Eva offers Ginko her help in capturing him, but the former has to face first the return of an old flame of his, noblewoman Altea.
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